We watched this on the new cable as kids, and loved every moment. What prepubescent kid didn't. Parker Stevenson and teen-idol Shaun Cassidy in the boy-detective lead roles of Frank and younger brother Joe. Then soon introducing the Poseidon Adventures, Pamela Sue Martin as Nancy Drew. It all worked and flowed brilliantly. Parker was already a seasoned young actor, and Shaun played his own role well. Not to mention the Powers included his vocal talents later into the series. The guys played well off each other. And when coupled with Nancy on certain episodes, the three truly meshed.
Watching it today as an adult, most of the episodes flow decently enough, though some scenes or dialogue appear to drag in certain places. But that may well have been the original editing. Overall, this classic '70s series has retained its original charm, and is well worth watching and re-watching.